From the 10:00 am Latin High Mass on the 2nd Sunday of Easter. St. Mary Major has one of the most beautiful Sunday liturgies in Rome, it is usually my first choice each week... if you are here over a Sunday, the Vatican sounds tempting, but it's not worth it -- too many tourists who don't understand what's going on and are very distracting. The Mass at St. Mary Major is just as beautiful, with fewer tourists and more congregational reverence, a fine lay choir, and when it finishes you still have time to hop onto the Metro and make it to St. Peter's Square to pray the Angelus with the Pope. Can't beat it!